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Sensors 2017, 17(7), 1547; https://doi.org/10.3390/s17071547

Measuring Torque and Temperature in a Rotating Shaft Using Commercial SAW Sensors

1
Department of Electronics, Telecommunications and Informatics, University of Aveiro, 3810-193 Aveiro, Portugal
2
Instituto de Telecomunicações, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
3
Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal
4
SENSeOR, 18 rue Alain Savary, 25000 Besançon, France
*
Author to whom correspondence should be addressed.
Received: 17 May 2017 / Revised: 23 June 2017 / Accepted: 27 June 2017 / Published: 2 July 2017
(This article belongs to the Special Issue Surface Acoustic Wave and Bulk Acoustic Wave Sensors)
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Abstract

Real-time monitoring of torque in a rotating shaft is not easy to implement with technologies such as optic fiber sensors or strain gages. Surface acoustic wave (SAW) sensors are wireless and passive and can be used to monitor strain in moving parts. Commercial solutions (sensors, antennas and interrogation unit) can easily be purchased from some companies; however, they are not customized and may not meet the specificity of the measurements. In order to evaluate the adequacy of commercial off-the-shelf (COTS) solutions, temperature and strain sensors fabricated by SENSeOR (Besançon, France) were mounted on a load cell. The sensors were calibrated using a thermal chamber and a universal testing machine. The load cell was then assembled together with a steel shaft that rotated at different speeds inside an oven. The commercial antennas were replaced with an RF (radio frequency) coupler and the sensors were interrogated with the commercial interrogation unit. The influence of rotation in the accuracy on the measurements, as well as the adequacy of the sensors structure, was evaluated. It can be concluded that SAW sensors can be used to measure temperature or torque in a rotating environment; however, some customization of the components is required in order to overcome the limitations posed by COTS sensing solutions. View Full-Text
Keywords: SAW sensor; rotating shaft; torque measurement SAW sensor; rotating shaft; torque measurement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Silva, D.; Mendes, J.C.; Pereira, A.B.; Gégot, F.; Alves, L.N. Measuring Torque and Temperature in a Rotating Shaft Using Commercial SAW Sensors. Sensors 2017, 17, 1547.

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